I've read lots of stories with thungs such as a subspace but there's usually teachers and ...

I've read lots of stories with thungs such as a subspace but there's usually teachers and the mc spends years inside mastering the skill. While here it seems that everything is rushing towards Woojin(?) well, I do hope we get to discover what the subspace actually means and not just a cheat code for him with no prior explanation what's it's purpose is and how did he acquire it. welp